Sand-blast device



Patented Sept. 2, 1930 1 UNITED STATES PATENT- OFFICE.

CHARLES A. DREISBACH, on NEW HAVEN, CONNECTICUT I SAND-BLAST DEVICApplication filed April 6, 1927; Serial -No."181,402

My invention relates to a sand blast-device soft packing 4 through which"-a stripof-mafor cleaning long strips, wires or rods, and terial '5under treatment-is adaptedto=pass,- the same is adapted to accomplishthe same this packing vserving to prevent back flow purpose as thedevice shown in the patent to of the air and sand. There is a'central'hub VVashburn No. 1,400,585. In the present de- 6 projectinginwardly from theend wall 2 5; vice a strip, bar, or rod of material,usually and this has a central bore-7 somewhat larger: metal, which isto be cleaned by a sandblast, in diameter than the largest strip ofmaterialis passed in a long or continuous length to be treated in thedevice. In addition, the through the sand blast portion of the deviceshell member 1 has a tubular projection8 10 so that a blast of sand andair at high veto which the air hose 9 is adapted to be con--60 locity isprojected against the surface of the nected for directing the currentofcommember which is being cleaned, and during pressed air into thechamber-1O formed with the operation the wire, rod or other member inthe casing memberl. It is understood under treatment passes continuouslythrough thatthepipe or tube 9 is connected with a the sand blast nozzlein order that the treatsuitable reservoir of an air compressing ma: c5-ment may be carried out as a continuous opchine of any well knownconstruction, the eration on a very long strip of material. Oneaircompressor being omitted from the drawobject of the present inventionis to improve ings as it forms no part of the present in'-- theconstruction and assembly of the sand vention and such devicesare-wellknown in so blast nozzle and its associated parts in order the art. Thecasing member 1 alsoincludes 70 that the parts may be made in thesimplest a top wall 11, a bottom wall 12 and end walls: and mosteconomical manner and in order 2, 13 all serving to define the airchamber that the parts may be assembled and disas-' 10 which surroundsthetubular extension 6 sembled quickly. Another advantageis that throughwhich the stripof material passes.

the parts of the sand blast nozzle which are In the present constructionthe members 75 subject to rapid wear may be removed and which form thesand blast nozzlebr -which' replaced quickly and at a very low cost.control the form and direction of. the blast Another advantage is thatthe portion of are adapted to be assembled with the casing the nozzlewhich determines the shape and member 1 and then this member'with such3U position of the blast of sand may be shaped parts assembled may beassembled in conin various ways to suit the particular cross neat-ionWith a second casing member ll section of the material under treatment.which forms the sand chamber nd Which Other advantages will appear inthe followcarries the discharge nozzle.

ing detailed description of my invention. The bore Of the tubularextension 6 is In the drawing forming part of this apthreaded as shownat 22, to receive a COI'Ie-'s5 plication, spondlngly threaded shank orextension 51- Figure 1 is a longitudinal, sectional view formed on therear end of the'interior nozzle through the center of a sand blastdevice member 17 the details of whichareshown' in embodying myinvention, Figure The remainder of this member .2) Figure 2 is an endelevation thereof taken: 17 is provided with a polygonal outer-sur-ecfrom the left hand end of Figure 1, 7 face which in the particularformillustrated Figure 3 is an elevation of the discharge in the drawingis substantially rectangular, nozzle detached fromthe casing, andhavingfour faces 18 With the 'corners're Figure 4 is a sectional viewtaken on the moved on thearc of a circle,-asshown at 19 4. line 4i4 ofFigure 1. in Figure l, to'conform with interior diameus The presentdevice includes a frame or ter of the second or outer noz'zlemember.casing made principally in two assembled The-forward or dischargeportion of this'nozsections. One of these sections shown at 1 zle'member 17 as shown at 20 is preferably has a rear wall 2 provided with arear socket frustro conical in shape, tapering from the so or opening 3to receive a compressible or ends oftheflat faces 18 This nozzle member45515 also has a. bore 21 extending longitudinally through it, ofslightly larger diameter than the largest strip of material which is tobe subjected to the sand blast action. The nozzle member 17 as abovestated, is threaded into the tubular extension 6 and it extendsforwardly through the tubular member 8 which is part of the casingmember 1; and in the form of the invention shown herein the interioropening or bore of this member 8 is of circular shape to be concentricwith the arc of the corners 19 of the nozzle member 17. The outer memberof the nozzle proper comprises a circular member 24 having a tubularextension 25 which is provided with an exterior thread which screws intothe threaded end 26 of the casing extension 8; and it also has a flange27 on its exterior which abuts against the'forward end of this extension8 and this joint may be packed with a suitable washer if desired. Thenozzle member 24 is provided with a central bore 28 formed on the arccorresponding with the several rounded corners 19 of the inner nozzlemember 17 so that the corners of this latter member may fit snuglyagainst the bore 28. The spaces 50 are formed between the flat faces 18of the member 17 and the bore 28 around the path of the rod 5. From thecylindrical bore 28 of the member 24 the opening decreases or tapers, asshown at 29 toward the discharge end of the nozzle and the diameteralong this tapered portion is somewhat larger than the exterior diameterof the frustro conical portion 20 of the inner nozzle member; so thatthere is formed between these two parts an annular space 30 surroundingthe path of the strip of material under treatment.

The other member of the casing comprises the tubular member 14 the rearend of which is closely fitted to the exterior of the tubular extension8 of the first casing member and it abuts against the shoulder 31 and,if desired, a suitable washer may be interposed at this point to preventleakage. The casing member 14 is provided with a top opening 32 intowhich the lower end of a hopper 33 feeds the sand into the sand chamber34. This casing member forms the compartment 34 which constitutes thesand chamber of the nozzle and it surrounds the discharge end of thenozzle member 24.

The right hand end of this casing member 14 in Figure 1 is provided witha frusto-conical bore 35 extending from the front of the sand chamber tothe extreme end of the easing member 14 into which the discharge nozzle36 is adapted to fit. The discharge nozzle is shown at 36 and itconsists of a tubular portion 37 which flares out in frustro conicalshape at the left hand end 88 the periphery of this frustro conicalportion being adapted to fit snugly into the frustro conical opening ofthe casing member 14 with the cylindrical portion of the dischargenozzle projecting beyond the end of the casing member. This dischargenozzle has a frustro conical bore 39 on the left hand end which mergeswith a cylindrical bore 40 through the center of whii'rh the piece ofmaterial under treatment adapted to travel. In order to hold thedischarge nozzle tightly in place and to prevent leakage of sand betweenit and the casing member 14, I have proviued a yoke 41 which is adaptedto be inserted through the top opening 32 where the hopper is attachedto the casing member 14 and this yoke, which is wedge shape, or tapered,is adapted to be forced between the ends of this discharge nozzle 87 andthe lugs 42 cast on the interior of the casing member 14 in order toforce the discharge nozzle into tight engagement with the frustroconical bore 35 in order that sand will not pass between the dischargenozzle and the casing member 14.

I have not shown the details of the hopper device as any type of hoppermay be employed with this device, but preferably the type of hoppershown in the said Washburn Patent No. 1,400,585.

In the operation of the device the strip of material 5 which is to besubjected to the ac tion of the sand blast is passed through the softpacking 4; through the bore of the nozzle member 17, passing through thesand chamber 34 and thence through the discharge nozzle 37; and when themachine is in operation this strip of material may be fed continuouslythrough the apparatus in order that the operation may be carried on as acontinuous one. Sand is continually introduced into the sand chamber 34from the hopper and compressed air is admitted through the pipe 9 intothe air chamber 10. The compressed air passes from the air chamber 10through the bore of the extension 8 and thence through the spaces formedbetween the polygonal outer surface of the outer nozzle member 24. Inthe form of the device shown herein a stream of air will be divided intofour parts corresponding with the four spaces 50 all disposedconcentrically around the axis of the travelling rod of metal 5. Fromthese spaces the compressed air enters the annular space 30 between thefrustro conical end 20 of the inner nozzle member and the frustroconical bore 29 of the outer nozzle member, so that the air current isdeflected around the entire surface of the rod 5; and as this air passesinto the sand chamber, it takes up the sand and projects it at hi hvelocity against the surface of the rod 5. The blast of sand is forcedat high velocity through the annular space formed between the travellingrod 5 and the bore of the discharge nozzle 37. This latter nozzle ispreferably of conside'able length as shown in the drawing, so that asthe blast of sand is travelling through this annular spa *c it isfrictionally acting upon the entire surface of the travelling rod 5 andit serves to remove any scale or corrosion which may be present alongthe rod, so that the rod emerges from the end of the discharge nozzle inclean condition. The action is more nearly a scouring action as thedevice does not depend entirely on the impact of the sand against thesurface of the rod 5.

It will be apparent that a blast of sand entirely surrounding thetravelling rod may be projected against the rod and that the action ofthe blast may be uniform all around the same, whereas when individualjets or nozzles are employed, as in the Washburn patent, the velocity ofthe sand blast is more or less localized at difierent points on thetravelling rod. With the present type of nozzle the jet or blast may beof annular form directed at a constant angle against the periphery ofthe travelling rod. Furthermore, the nozzle is of very simple andinexpensive construction as the inner and outer members 17, 24: may beeasily and inexpensively made. If a rod other than round is to betreated in the device, it is very easy to remove the nozzle members 17,24 and substitute other nozzle members having the space shaped toconform with the shape of the rod under treatment. For instance, if arod of oblong cross section is to be treated, thenthe annular space 30which controls the deflection of the blast against the rod may besimilarly shaped in order that the blast will act uniformly on thesurface of the rod. Likewise an oval or any other shaped rod may beuniformly treated by simply supplying the nozzle members in which theannular space 30 is shaped to correspond with the periphery of theparticular shaped rod.

In assembling the device the inner nozzle member 17 is screwed into thetubular extension 6 of the casing member 1 and then the outer nozzlemember 2a is screwed into the tubular portion 8 of the same casingmember 1; and this will bring the nozzle members into the properoperative relation to form the air passages as herein described. Thedischarge nozzle is introduced into the bore 30 of the casing member 1aand the wedge yoke 4-1 is then inserted to lock the discharge nozzle inplace and after that the two casing members are assembled in theposition shown in Figure 1.

Having described my invention, what I claim is:

l. A sanding device adapted to operate upon a long strip of materialpassing therethrough, comprising a casing forming an air chamber and asand chamber following sail air chamber in the direction of travel ofthe strip, a tubular member detachably mounted inside said air chamberand projecting into said sand chamber and having a bore through whichsaid strip travels, means for feeding air to said air chamber wherebysaid air surrounds said tubular member, a second tubular member mountedin said casing to be detachable separately from said first tubularmember and disposed in said sand chamber to surround a portion of saidfirst tubular member and co-operating therewith to form an interveningpassageway to conduct air from said air chamber into said sand chamberand to project the air and sand against the traveling strip.

2. A sanding device adapted to operate upon a long strip of materialpassing therethrough, comprising a casing forming an air chamber and asand chamber following said air chamber in the direction of travel ofsaid strip, said casing having a tubular support in said air chamber anda tubular support opening into said sand chamber, a tubular memberdetachably mounted in said first tubular support to lie inside said airchamber and to project into said sand chamber, and having a bore throughwhich said strip travels, means for feeding air to said air chamberwhereby said air surrounds said tubular member, a second tubular memberdetachably mounted in said second tubular support and disposed in saidsand chamber to surround a portion of said first tubular member andco-operating therewith to form an intervening passageway to conduct airfrom said air chamber into said sand chamber and to project the air andsand against the traveling strip.

3. A sanding device adapted to operate upon a long strip of materialpassing therethrough, comprising a casing forming an air chamber and asand chamber following said air chamber in the direction of travel ofsaid strip, a tubular member detachably mounted in said air chamber andprojecting into said sand chamber and having a bore through which saidstrip travels, means for feeding air to said air chamber, a secondtubular member detachably mounted in said casing and surrounding saidfirst tubular member and cooperating therewith to form an annular spacesurrounding said strip, said tubular members co-operating to conduct airfrom said air chamber into said sand chamber and to project the air andsand against the traveling strip.

4. A sanding device adapted to operate upon a long strip of materialpassing therethrough, comprising a casing forming an air chamber and asand chamber following said air chamber in the direction of travel ofsaid strip, said casing having a tubular support in said air chamber anda tubular support opening into said sand chamber, a tubular memberthreaded into said first tubular support to lie in said air chamber andto project into said sand chamber, and having a bore through which saidstrip travels, means for feeding air into said air chamber, a secondtubular member threaded into said second.

its

tubular support and disposed in said sand chamber to surround a portionof said first tubular member and co-operating therewith to form anintervening passageway to con duct air from said air chamber into saidsand chamber and to project the air and sand against the travelingstrip.

Signed the 25th day of March, 1927, at New York, county of New York,State of New York.

CHARLES A. DREISBACH.

